Portable telephone



I May 29, 1945. J. L. LONG V 2,377,162

PORTABLE TELEPHONE Filed Feb. 18, 1944 L/4CK A. LONG 4 r roelv yPatented May 29,1945

UNITED STATES PATENT OFFICE PORTABLE TELEPHONE Jack L Long, UnitedStates Army Application February 18, 1944, SerialNo. 522,994

' (Granted under the act of March 3, 1883, as

amended April 30, 1928; 379 0. G. 757) 6 Claims.

The invention described herein may be,manufactured and used by or forthe Government for governmental purposes, without thewpayment to me ofany royalty thereon.

This invention relates to a portable telephone in which all theapparatus which can be connected to lines for receiving at andtransmitting contacts 6 and I and thereby connect battery ll across linewires l and I6. At the receiving station shown in Fig. 1, electricitypasses from line wire I6, switch contacts 1, 8, relay coil l8, andswitch contacts I3, II to line l5. This energizes relay coil l8 andsolicits movable contact 20 into engagement with stationary contact 2!.

. Closure of contacts 20 and 2! completes a cir- Objects of thisinvention are thereforei first.

to provide a handy, portable telephone; second, to provide, in atelephone systerma ringing circuit in which the signal is energized froma local battery in the talking circuit; and third, to provide in such atelephone system a sensitive rein one hand of the user and held inposition so.

that the receiver 3 is adjacent his ear while the microphone ortransmitter 4 is juxtaposed to his mouth. Handle 5 operates ringingswitch 6 'l- 8 while handle 9 operates talking switch Ill-l ll 2l3.Pigtails l5 and I6 represent the line connections.

Referring now to Fig. 1, it is to be understood that all the elementsare enclosed within casing I and cover 2 except handles Stand 9,pigtails l5 and I6, receiver 3, and transmitter 4, all of which arecarried by casing I or cover 2. Connected between line I5 and switchpoint 6 is battery I]. Relay coil i8 is connected between switch points8 and I 3. Signal l9 and relay contacts and 2| are connected in seriesacross local battery 22. The microphone or talking circuit includes'movabl'e switch member I], stationary switch contact l2, battery 22,transmitter tinduction coil 23 and switch point-I0. Line wire I6 isconrlected in series with receiver 3, induction coil Zlswitch point Ill,and line wire l5.

station, handle 5 'is operated toengage switch cuit. through electricbell i9 and battery 22. When the attention of the user is arrested by asignal from bell l9, he operates handle 9 to open switch contacts ll, i3and close switch contacts II, III and I2. Opening contacts l3, llde-energizes coil l8 and, therefore, signal i9, while closing contactsII, Ill, 12, throws receiver 3 and 'ment is that the ringing current forelectric bell station. At the receiving station, the sensitive.

relay closes the bell circuit through the relatively low voltage (saysix volts for example) battery 22 which rings the bell l9. It isunderstood that battery is the equivalent of and may be replaced by asmall hand generator.

I claim:

1. A;ringing circuit for a telephone system having a line circuit andhaving a local battery in the microphone circuit comprising a signalingdevice and'a normally open electric switch con-- nected in series acrosssaid local battery, and a normally closed ringing switch and anelectrically-operated means for closing said normally open electricswitch and anormally closed talking switch connected in series acrossthe line circuit whereby a flow of electricity through the line circuitenergizes said electrically-operated means and causes it to close saidnormally open electric switch and. cause actuation of said si naling.device.

2. A portable telephone handset adapted for connection toa' temporaryline or the like comprising a casing adapted to be grasped by the handand having the following elements mounted on it, a battery and anormally open ringing switch connected in series and adapted" forconnection across the line, a normally open microphone switch and alocal battery and a transmitter and a ,receiver connected in series andforming a talking circuit adapted for connection across the line, anormally open local switch and a signaling device connected across saidlocal battery, and a normally closed second talking switch and anelectrically-operated means for closing said normally open local switchand a normally closed third talking switch connected in series andadapted for connection across the line.

3. In a telephone handset for conrfection to a line, a casing carrying atransmitter adjacent one end and a receiver adjacent the other end, anormally open talking switch and a local battery both in said casing andconnected in series so as to be placed across the line, meansforattracting the attention of a user and normally open relay contactsboth in said casing and con.- nected in series with said local battery,and a manually operable ringing switch and a coil operating said relaycontacts both in said casing and connected in series with the line, saidcoil, when energized, serving to close said relay contacts and connectsaid means in circuit across said local battery, thereby causing saidmeans to operate.

4. ,In a'portable telephone sending and receiving unit for use with aline and inclding a sheet metal casing consisting of a cover and ahousing. said housing being adapted to be grasped by the hand of theoperator to support the entire case ing thereby, a microphone and areceiver both mounted on said casing, said microphone and said receiverbeing so spaced that they may be located simultaneously in juxtapositionto the mouth and ear respectively of the operator when the peratorsupports the casing by hand, a lo- I a line and including transmittingapparatus and receiving apparatus, a casingserving as a mounting forsaid apparatuses and afiording a grip for trically connected to theline, said device including a switch operating handle projecting fromsaid casing, a switch in said casing and arranged for manual operationby said handle, a relay-coil in said casing and connected under thecontrol of said switch, relay contacts under the control of said relaycoil, and a signal in said casing and connected in series with saidrelay contacts across said local battery.

6. In a portable telephone system, a handset comprising a casing of suchlength and small size that it may be grasped by the hand and oppositeends thereof placed adjacent an ear and the mouth respectively of theoperator, a two wire line entering the casing, a microphone adjacent oneend of said casing and supported thereby, a receiver adjacent the otherend of said casing and supported thereby; and the following parts alllocated in said casing; a local low voltage battery, a bell and normallyopen relay contacts in series with said battery, a relay having a coilfor operating said contacts, a single pole double throw switch havingfirst and second contacts which may be alternately energized by the poleof the switch, means connecting the pole of the switch to the first sideof said line, means conmeeting the first contact to one side of saidrelay coil, a normally closed manually operable switch, means connectingthe other side of said relay coil through said last-mentioned switch tothe second side of said line, a relatively high voltage source, meansconnecting the second contact of said double throw switch through saidhigh voltage source-to the second side of said line, said receiver beingconnected in series with said line, a microphone transformer 'having aprimary winding in series with said microphone and local low voltagebattery and having a secondary side of said line.

JACK L. LONG;

